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ATI Serpentine SFI 18.1 Super Damper - 7.480 in OD - Black - Internal Balance - GM LS-Series 917266 Radio Jumper Cable Motive Products Power Bleeder isProduct Description: Harmonic Balancer Serpentine Super Damper 7. 480 in OD SFI 18. 1 Aluminum Steel Black Internal Balance GM LS Series Sold Individually ATI Performance Products is a company founded on innovation, precision and service. ATI harmonic Super Dampers add horsepower and torque to race, street and truck engines. ATI Performance Products is the creation of over 40 years of Transmission and performance component manufacturing and racing